Chemical Engineering MCQs

Page No. 29

Air filtration in a furnace___________________?


aReduces its thermal efficiency

✓


bIs indicated by flame sting out

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cIncreases the flue gas temperature

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dNone of these

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Ceramic recuperators (made of SiC) is economical, only when used for preheating combustion air above _____________ °C?


a250

✖


b650

✓


c850

✖


d1000

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View Answer 650

Regenerators are used for waste heat recovery in____________________?


aBy-product coke ovens

✓


bBeehive coke oven

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cBlast furnace stoves

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dSoaking pits

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View Answer By-product coke ovens

Combustion of furnace oil in a furnace (soaking pit) with preheated combustion air at 400°C results in saving of about __________ percent furnace oil as compared to its combustion with atmospheric air, if the flue gas outlet temperature from the soaking pit is 1200°C ?


a5

✖


b60

✖


c20

✓


d40

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View Answer 20

In a muffle furnace, the muffle_________________?


aRetards the heat transfer

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bAssists in temperature equalisation in the charge

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cPermits the use of controlled atmosphere for the protection of stock

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dAll A., B. and C.

✓


View Answer All A., B. and C.

Hearth furnaces are not used for____________________?


aRoasting

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bMelting

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cReheating

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dNone of these

✓


View Answer None of these

Decarburisation of steel__________________?


aIs the removal of carbon from iron carbide (Fe3C)

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bAffects its crystalline structure

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cIs favoured by CO2

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dAll A., B. and C.

✓


View Answer All A., B. and C.

Maximum heat transfer in high temperature furnaces is by____________________?


aConduction

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bConvection

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cRadiation

✓


dEither A., B. or C.; depends on the type of furnace

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View Answer Radiation

Design of waste heat boiler for recovery of waste heat from furnace gases depends upon the_________________?


aQuantity & temperature of waste gas

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bDust concentration & nature of dust in waste gas

✓


cCorrosive nature of the waste gas

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dAll A., B. and C.

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Rate of heat release in a furnace, which is the measure of heat intensity, is defined as_________________?


akcal/hr/m3 combustion space

✓


bkcal/m3 combustion space

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ckcal/hr

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dNone of these

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